"I mean, the family is devastated, of course," Bass said. "This is the only family that Lamar has."

Odom's mother died of colon cancer when he was 12 years old, and his father has long struggled with addiction. Odom's strained relationship with his father was documented on the reality show Khloe & Lamar, which aired for two seasons from 2011 - 2012.

A source told ET on Thursday that Odom has had a few encouraging moments, fluttering his eyes and it's believed that at one point he squeezedKim Kardashian's hand. Still, ET is being told that the 35-year-old's kidneys are a top concern and that he has been placed on dialysis.

"I know from Kris, Kris loves him so much and she was the one that would just call him so much and stay in touch and make sure that he's OK," Bass said on Thursday. "They knew [Odom] was an addict and they wanted to make sure he was safe.

"There was really nothing they could do and you get to the point, you keep getting told when a family member or friend is going through something like that, sometimes you just have to cut it off and that's what they had to do with him," Bass continued. "It cannot be an easy thing. They are by his side right now, they are in Vegas. It's just a sad situation all around."